The U.S. and Russia appear on the verge of agreeing to a new arms control treaty that would reduce their strategic nuclear arsenals by at least one quarter.
The world is looking to the president to wrest some credible success from climate negotiations, and there were some signs that a meaningful political deal might be at hand.
Since 2001, the F.B.I. and Muslim leaders have tried to build a relationship of trust, but those relations have reached a new low point, Muslim leaders say.
A deceased former player was found to have a disease associated with repeated head trauma, linking the sport for the first time to health risks faced by football players.